linux-kernel - [PATCH 08/10] dmaengine: at_xdmac: Drop locking in at_xdmac_alloc_chan

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Date:   Thu, 23 Jan 2020 14:03:14 +0000
From:   <Tudor.Ambarus@...rochip.com>
To:     <Ludovic.Desroches@...rochip.com>, <dan.j.williams@...el.com>,
        <vkoul@...nel.org>
CC:     <dmaengine@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <Tudor.Ambarus@...rochip.com>
Subject: [PATCH 08/10] dmaengine: at_xdmac: Drop locking in
 at_xdmac_alloc_chan_resources()

From: Tudor Ambarus <tudor.ambarus@...rochip.com>

There is no need for locking in device_alloc_chan_resources(),
the DMA core takes care of it by using a dma_list_mutex around
the DMA devices.

Signed-off-by: Tudor Ambarus <tudor.ambarus@...rochip.com>
---
 drivers/dma/at_xdmac.c | 11 ++---------
 1 file changed, 2 insertions(+), 9 deletions(-)

diff --git a/drivers/dma/at_xdmac.c b/drivers/dma/at_xdmac.c
index 3d6e84def7a6..8fb01bc90ba7 100644
--- a/drivers/dma/at_xdmac.c
+++ b/drivers/dma/at_xdmac.c
@@ -1820,22 +1820,17 @@ static int at_xdmac_alloc_chan_resources(struct dma_chan *chan)
 	struct at_xdmac_chan	*atchan = to_at_xdmac_chan(chan);
 	struct at_xdmac_desc	*desc;
 	int			i;
-	unsigned long		flags;
-
-	spin_lock_irqsave(&atchan->lock, flags);
 
 	if (at_xdmac_chan_is_enabled(atchan)) {
 		dev_err(chan2dev(chan),
 			"can't allocate channel resources (channel enabled)\n");
-		i = -EIO;
-		goto spin_unlock;
+		return -EIO;
 	}
 
 	if (!list_empty(&atchan->free_descs_list)) {
 		dev_err(chan2dev(chan),
 			"can't allocate channel resources (channel not free from a previous use)\n");
-		i = -EIO;
-		goto spin_unlock;
+		return -EIO;
 	}
 
 	for (i = 0; i < init_nr_desc_per_channel; i++) {
@@ -1852,8 +1847,6 @@ static int at_xdmac_alloc_chan_resources(struct dma_chan *chan)
 
 	dev_dbg(chan2dev(chan), "%s: allocated %d descriptors\n", __func__, i);
 
-spin_unlock:
-	spin_unlock_irqrestore(&atchan->lock, flags);
 	return i;
 }
 
-- 
2.23.0